sedimentary

Weathered sandstone (probable arkosic sandstone)

Clastic sandstone, mainly quartz (SiO₂) with feldspar and iron-oxide cement

AI-generated identification · may be incorrect

Tan-orange, dull and strongly weathered, with visible gritty grains and possible pebble fragments; quartz hardness ~7, feldspar ~6, overall specimen typically 5–7. Non-cleaved, porous, and low-to-moderate specific gravity (~2.2–2.7).

Identified September 18, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand and minor gravel were deposited, compacted, and cemented in a river, floodplain, or alluvial setting; its exact age cannot be determined from the image and may range from Paleozoic to recent lithified deposits.

Uses & applications

Used as building and paving stone, aggregate, and architectural facing; ordinary loose specimens have little commercial or jewelry value.

Geological facts

The reddish-orange coloration commonly comes from hematite or limonite coatings. Rounded clasts and irregular weathering suggest transport and later cementation rather than an igneous origin.

Field identification & locations

Identify by gritty texture, visible sedimentary grains, layering or clasts, and lack of interlocking crystals; dilute hydrochloric acid may fizz only if calcite cement is present. Common worldwide in sedimentary basins and stream deposits.